/*
******************************************************************************
*
* Copyright (C) 1997-2011, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
*
* FILE NAME : putilimp.h
*
* Date Name Description
* 10/17/04 grhoten Move internal functions from putil.h to this file.
******************************************************************************
*/
#ifndef PUTILIMP_H
#define PUTILIMP_H
#include "unicode/utypes.h"
#include "unicode/putil.h"
/*==========================================================================*/
/* Platform utilities */
/*==========================================================================*/
/**
* Platform utilities isolates the platform dependencies of the
* libarary. For each platform which this code is ported to, these
* functions may have to be re-implemented.
*/
/**
* Floating point utility to determine if a double is Not a Number (NaN).
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isNaN(double d);
/**
* Floating point utility to determine if a double has an infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isInfinite(double d);
/**
* Floating point utility to determine if a double has a positive infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isPositiveInfinity(double d);
/**
* Floating point utility to determine if a double has a negative infinite value.
* @internal
*/
U_INTERNAL UBool U_EXPORT2 uprv_isNegativeInfinity(double d);
/**
* Floating point utility that returns a Not a Number (NaN) value.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_getNaN(void);
/**
* Floating point utility that returns an infinite value.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_getInfinity(void);
/**
* Floating point utility to truncate a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_trunc(double d);
/**
* Floating point utility to calculate the floor of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_floor(double d);
/**
* Floating point utility to calculate the ceiling of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_ceil(double d);
/**
* Floating point utility to calculate the absolute value of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fabs(double d);
/**
* Floating point utility to calculate the fractional and integer parts of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_modf(double d, double* pinteger);
/**
* Floating point utility to calculate the remainder of a double divided by another double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmod(double d, double y);
/**
* Floating point utility to calculate d to the power of exponent (d^exponent).
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_pow(double d, double exponent);
/**
* Floating point utility to calculate 10 to the power of exponent (10^exponent).
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_pow10(int32_t exponent);
/**
* Floating point utility to calculate the maximum value of two doubles.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmax(double d, double y);
/**
* Floating point utility to calculate the minimum value of two doubles.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_fmin(double d, double y);
/**
* Private utility to calculate the maximum value of two integers.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_max(int32_t d, int32_t y);
/**
* Private utility to calculate the minimum value of two integers.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_min(int32_t d, int32_t y);
#if U_IS_BIG_ENDIAN
# define uprv_isNegative(number) (*((signed char *)&(number))<0)
#else
# define uprv_isNegative(number) (*((signed char *)&(number)+sizeof(number)-1)<0)
#endif
/**
* Return the largest positive number that can be represented by an integer
* type of arbitrary bit length.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_maxMantissa(void);
/**
* Floating point utility to calculate the logarithm of a double.
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_log(double d);
/**
* Does common notion of rounding e.g. uprv_floor(x + 0.5);
* @param x the double number
* @return the rounded double
* @internal
*/
U_INTERNAL double U_EXPORT2 uprv_round(double x);
#if 0
/**
* Returns the number of digits after the decimal point in a double number x.
*
* @param x the double number
* @return the number of digits after the decimal point in a double number x.
* @internal
*/
/*U_INTERNAL int32_t U_EXPORT2 uprv_digitsAfterDecimal(double x);*/
#endif
/**
* Time zone utilities
*
* Wrappers for C runtime library functions relating to timezones.
* The t_tzset() function (similar to tzset) uses the current setting
* of the environment variable TZ to assign values to three global
* variables: daylight, timezone, and tzname. These variables have the
* following meanings, and are declared in <time.h>.
*
* daylight Nonzero if daylight-saving-time zone (DST) is specified
* in TZ; otherwise, 0. Default value is 1.
* timezone Difference in seconds between coordinated universal
* time and local time. E.g., -28,800 for PST (GMT-8hrs)
* tzname(0) Three-letter time-zone name derived from TZ environment
* variable. E.g., "PST".
* tzname(1) Three-letter DST zone name derived from TZ environment
* variable. E.g., "PDT". If DST zone is omitted from TZ,
* tzname(1) is an empty string.
*
* Notes: For example, to set the TZ environment variable to correspond
* to the current time zone in Germany, you can use one of the
* following statements:
*
* set TZ=GST1GDT
* set TZ=GST+1GDT
*
* If the TZ value is not set, t_tzset() attempts to use the time zone
* information specified by the operating system. Under Windows NT
* and Windows 95, this information is specified in the Control Panel's
* Date/Time application.
* @internal
*/
U_INTERNAL void U_EXPORT2 uprv_tzset(void);
/**
* Difference in seconds between coordinated universal
* time and local time. E.g., -28,800 for PST (GMT-8hrs)
* @return the difference in seconds between coordinated universal time and local time.
* @internal
*/
U_INTERNAL int32_t U_EXPORT2 uprv_timezone(void);
/**
* tzname(0) Three-letter time-zone name derived from TZ environment
* variable. E.g., "PST".
* tzname(1) Three-letter DST zone name derived from TZ environment
* variable. E.g., "PDT". If DST zone is omitted from TZ,
* tzname(1) is an empty string.
* @internal
*/
U_INTERNAL const char* U_EXPORT2 uprv_tzname(int n);
/**
* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
* This function is affected by 'faketime' and should be the bottleneck for all user-visible ICU time functions.
* @return the UTC time measured in milliseconds
* @internal
*/
U_INTERNAL UDate U_EXPORT2 uprv_getUTCtime(void);
/**
* Get UTC (GMT) time measured in milliseconds since 0:00 on 1/1/1970.
* This function is not affected by 'faketime', so it should only be used by low level test functions- not by anything that
* exposes time to the end user.
* @return the UTC time measured in milliseconds
* @internal
*/
U_INTERNAL UDate U_EXPORT2 uprv_getRawUTCtime(void);
/**
* Determine whether a pathname is absolute or not, as defined by the platform.
* @param path Pathname to test
* @return TRUE if the path is absolute
* @internal (ICU 3.0)
*/
U_INTERNAL UBool U_EXPORT2 uprv_pathIsAbsolute(const char *path);
/**
* Use U_MAX_PTR instead of this function.
* @param void pointer to test
* @return the largest possible pointer greater than the base
* @internal (ICU 3.8)
*/
U_INTERNAL void * U_EXPORT2 uprv_maximumPtr(void *base);
/**
* Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
* In fact, buffer sizes must not exceed 2GB so that the difference between
* the buffer limit and the buffer start can be expressed in an int32_t.
*
* The definition of U_MAX_PTR must fulfill the following conditions:
* - return the largest possible pointer greater than base
* - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
* - avoid wrapping around at high addresses
* - make sure that the returned pointer is not farther from base than 0x7fffffff bytes
*
* @param base The beginning of a buffer to find the maximum offset from
* @internal
*/
#ifndef U_MAX_PTR
# if defined(OS390) && !defined(_LP64)
/* We have 31-bit pointers. */
# define U_MAX_PTR(base) ((void *)0x7fffffff)
# elif defined(OS400)
# define U_MAX_PTR(base) uprv_maximumPtr((void *)base)
# elif 0
/*
* For platforms where pointers are scalar values (which is normal, but unlike i5/OS)
* but that do not define uintptr_t.
*
* However, this does not work on modern compilers:
* The C++ standard does not define pointer overflow, and allows compilers to
* assume that p+u>p for any pointer p and any integer u>0.
* Thus, modern compilers optimize away the ">" comparison.
* (See ICU tickets #7187 and #8096.)
*/
# define U_MAX_PTR(base) \
((void *)(((char *)(base)+0x7fffffffu) > (char *)(base) \
? ((char *)(base)+0x7fffffffu) \
: (char *)-1))
# else
/* Default version. C++ standard compliant for scalar pointers. */
# define U_MAX_PTR(base) \
((void *)(((uintptr_t)(base)+0x7fffffffu) > (uintptr_t)(base) \
? ((uintptr_t)(base)+0x7fffffffu) \
: (uintptr_t)-1))
# endif
#endif
#if U_ENABLE_DYLOAD
/* Dynamic Library Functions */
typedef void (UVoidFunction)(void);
/**
* Load a library
* @internal (ICU 4.4)
*/
U_INTERNAL void * U_EXPORT2 uprv_dl_open(const char *libName, UErrorCode *status);
/**
* Close a library
* @internal (ICU 4.4)
*/
U_INTERNAL void U_EXPORT2 uprv_dl_close( void *lib, UErrorCode *status);
/**
* Extract a symbol from a library (function)
* @internal (ICU 4.8)
*/
U_INTERNAL UVoidFunction* U_EXPORT2 uprv_dlsym_func( void *lib, const char *symbolName, UErrorCode *status);
/**
* Extract a symbol from a library (function)
* Not implemented, no clients.
* @internal
*/
/* U_INTERNAL void * U_EXPORT2 uprv_dlsym_data( void *lib, const char *symbolName, UErrorCode *status); */
/**
* Define malloc and related functions
* @internal
*/
#if defined(OS400)
# define uprv_default_malloc(x) _C_TS_malloc(x)
# define uprv_default_realloc(x,y) _C_TS_realloc(x,y)
# define uprv_default_free(x) _C_TS_free(x)
/* also _C_TS_calloc(x) */
#else
/* C defaults */
# define uprv_default_malloc(x) malloc(x)
# define uprv_default_realloc(x,y) realloc(x,y)
# define uprv_default_free(x) free(x)
#endif
#endif
#endif